Adam and Eve could NOT have sinned unless God himself provided not ONLY the means, but the PENALTY for eating the forbidden fruit. God planted the tree in the garden in order that they would eat, so that his PLAN FOR SALVATION would go forth. That is, of course, unless God didn’t know what he planted, and didn’t know that they would eat, and that God then had to scramble around trying to find a way to fix the mess that Adam did all by himself. I could just imagine THAT conversation... “Well, Son, looks like I’ve got to kill you, they did something I didn’t expect, that’s for sure.”